So looking on the front of the bike at the radiator, just under the radiator is a square sensor that has 4 capped off cylinders inside. Does anybody know what sensor this is. It does not say in the owners manual?
Hi and welcome to the forum 
Not sure but maybe another owner can help
Hi and welcome. A photo would help?
Welcome.
Not familiar with the Speed Twin, as said a photo would help (dead easy to load on this forum).
But I suspect it quite possible not to be a sensor at all. Triumph often have unused connectors in the loom in readiness for optional extras or other country requirements. The contacts of the connector are often sealed off with small rubber bungs to keep it waterproof (to be removed if connector is used).
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